Uptake of Stable Strontium by Plants and Effects on Plant Growth

Abstract

5 In contrast to the numerous publications on uptake of radioactive strontium (85 Sr, 89 Sr, and 90 Sr) and its effects on plant growth resulting from irradiation by strontium or its radioactive daughter nuclides (e.g., Y-90), only a few articles exist on the uptake of stable Sr2+ and its possible effects on plant growth. Nevertheless there are two reasons why uptake of stable Sr 2 + and its effects on plant growth are of great importance. First, from the viewpoint of plant physiology and plant nutrition it is interesting to know both the uptake and the effects of stable Sr2 + in relationship to the chemically related Ca 2 +. Similar study has already been carried out with other corresponding groups of ions (Li+ and Ca2+, Rb+ and K+, Brand C.-, or SO/-and SeO/-, pol-and ArOl-). With respect to the uptake and translocation of stable Sr2 + by the plant (but not with regard to its effects on plant growth), studies with radioactive strontium isotopes are very helpful. Second, from the ecological viewpoint, it is worthwhile to obtain information on regional and species differences in plant uptake and effects of stable Sr 2 + on growth. Numerous views have been expressed concerning the mechanisms of uptake and translocation of Sr2 + by the plants. However, concise results on the effects on plant growth are rare and differ widely. This article presents current views on Sr 2 + uptake and subsequent translocation by the plant, as well as discussion of the effects of stable Sr 2 + on plant growth. UPTAKE AND TRANSLOCATION OF STABLE Sr 2 + BY PLANTS Sr 2 +Content of Soils and Plants Strontium is an element found in most soils and consequently in most plants. Its natural level in most soils is low. Comar (I) has calculated that